To the minstrels of medieval Europe, the moon was a kind of celestial
junkyard. They consigned to lunar banishment a dolorous assortment of
such earthly intangibles as broken vows, fruitless tears and misspent
time. Today the moon is a repository of more substantial material: it
harbors a pile of gear, left behind by Apollo astronauts, that includes
one moon buggy, $5 million worth of camera equipment and two golf balls
that Alan Shepard whacked with a makeshift six iron to unplayable lies
in...